Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1062:
1913, Tercentenary of the Romanov Dynasty, Alexander I, imperforated large die proof of 20k in blue, printed on chalk-surfaced thick paper, size 35x49mm, minor traces of previous mounts, no defects, VF and rare proof in blue color, Est. $1,300-$1,600 , Sc. #96
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